<template>
  <div class="wrapper" ref="wrapper">
    <div class="content">
      <slot></slot>
    </div>
  </div>
</template>

<script>
import BScroll from 'better-scroll'

export default {
  name: "Scroll",
  props: {
    probeType: {
      type: Number,
      default: 0
    },
    pullUpLoad: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      scroll: null,
    }
  },
  created() {
    this.$nextTick(() => {
      //1.创建BScroll对象
      this.scroll = new BScroll(this.$refs.wrapper, {
        probeType: this.probeType,
        pullUpLoad: this.pullUpLoad,
        click: true
      })
      //2.监听滚动的位置
      if(this.probeType === 2 || this.probeType ===3) {
        this.scroll.on('scroll', (position) => {
          this.$emit('scroll',position)
        })
      }
      //3.监听scroll滚动到底部
      if(this.pullUpLoad) {
        this.scroll.on('pullingUp', () => {
          this.$emit('pullingUp')
        })
      }
    })
  },
  methods: {
    //1.滚动效果
    scrollTo(x, y, time = 300) {
      this.scroll && this.scroll.scrollTo(x, y, time)
    },
    //2.完成数据请求
    finishPullUp() {
      this.scroll && this.scroll.finishPullUp()
    },
    //更新Dom
    refresh() {
      this.scroll && this.scroll.refresh()
    },
    //获取当前的y值
    getScrollY() {
      return this.scroll ? this.scroll.y : 0;
    }
  }
}
</script>

<style scoped>

</style>
